Two-step hydrothermal synthetic method of niobium-tungsten complex oxide and its adsorption of methylene blue

[Display omitted] •Niobium-tungsten complex oxide was synthesized via two-step hydrothermal method.•Pure Nb18W16O93 was obtained under hydrothermal condition of pH 3.•Complex oxide exhibited an excellent performance for methylene blue adsorption.•Adsorption kinetics data can be fitted well by the ps...

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Bibliographic Details
Published in:Inorganica Chimica Acta 2020-07, Vol.507, p.119562, Article 119562
Main Authors: Yu, Juhyon, Han, Yongnam, Jong, Hunil, Jong, H.I., Ra, Gangjin
Format: Article
Language:English
Subjects:
Adsorption
Dyes
Heat treatment
Hydrothermal method
Methylene blue
Niobium
Niobium-tungsten complex oxide
Room temperature
Synthesis
Tungsten oxides
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Summary:[Display omitted] •Niobium-tungsten complex oxide was synthesized via two-step hydrothermal method.•Pure Nb18W16O93 was obtained under hydrothermal condition of pH 3.•Complex oxide exhibited an excellent performance for methylene blue adsorption.•Adsorption kinetics data can be fitted well by the pseudo second-order model. Niobium-tungsten oxide Nb18W16O9 was successfully synthesized by a two-step hydrothermal process and heat treatment. The structural and characteristics of samples and their adsorption of methylene blue (MB) have been investigated by XRD, SEM and UV–Vis spectrometer. Structural results indicated that the sample obtained through heat-treatment in the case of pH = 3 is a niobium-tungsten oxide (Nb18W16O93) with Pbam space group. Meanwhile, adsorption of methylene blue on niobium-tungsten complex oxide showed that the calcined sample with nanobar-shape synthesized by a two-step hydrothermal process in pH range of 3 adsorbed above 97% methylene blue with the concentration of 10 mg/L in 5 min at room temperature. Also, it has been showed that its adsorption is superior to an as-hydrothermal prepared sample.
ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2020.119562